Catalog - Groshenyia Catalog - Groshenyia


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Groshenyia groshenyae Georgescu,M.D. 2012


Citation: Groshenyia Georgescu 2012
taxonomic rank: Genus
Type age (chronostrat): Upper Albian; from the P. ticinensis Biozone to the lower part of P. appenninica Biozone).
Type locality: Western Tethys (Switzerland, Italy), North Atlantic Ocean (Blake Plateau, Mazagan Plateau, Bermuda Rise, offshore Spanish Sahara and Vigo Seamount) and Caribbean region (Trinidad, Puerto Rico Trench)

Current identification:

Original Description

Type species.- Schackoina pentagonalis Reichel, 1948, by original designation.

Species included. Initiating species (IS): Groshenyia groshenyae – new species and first descendant species (FDS): G. pentagonalis (Reichel, 1948).

Diagnosis. Smooth late Albian schackoinids, which exhibit a transition from very low trochospiral tests with petaloid or clavate chambers and extraumbilical-peripheral aperture to tests with adult planispiral coiling, radially elongate chambers bearing one distal bulbous projection and equatorial aperture.

Description. Test is very low trochospiral in G. groshenyae and with adult planispirally coiled stage in G. pentagonalis. Earlier chambers are globular or subglobular, those in the adult stage tangentially elongate, petaloid, more rarely clavate in G. groshenyae and radially elongate, bearing one distal bulbous projection in G. pentagonalis. Sutures are distinct, depressed and radial on both test sides. Test slightly asymmetrical in edge view in G. groshenyae and symmetrical in G. pentagonalis. Aperture exhibits a gradual transition from a low arch in extraumbilical-peripheral position in the G. groshenyae to a low to medium high arch in equatorial position in G. pentagonalis; it is bordered by a delicate imperforate lip, which is rarely preserved; relict periapertural structures occasionally occur in the umbilical region. Chamber surface is smooth. Test wall is calcitic, hyaline, simple and perforate; pores are circular to subcircular.

The genus name honours Dr D. Grosheny (Université de Strasbourg) as appreciation for her outstanding contributions in foraminiferal studies.

Extra details from original publication

Remarks. Groshenyia differs from Leupoldina of the late Barremian-Aptian by having elongate chambers of G. pentagonalis with one distal bulbous projection without the tendency to bifurcate and test wall with larger pores. Tests with elongate chambers bearing distal bulbous projections of late Aptian-early late Albian are not known, thereby leading to the conclusion that the two resulted through iterative evolution. Lilliputianella Banner and Desai,1988 and Lilliputianelloides BouDagher-Fadel, Banner and Whittaker, 1997 of the Aptian present radially elongate chambers, which can be either petaloid or pointed, but do not develop distal bulbous projections as Groshenyia.


Georgescu, M. D. (2012b). Morphology, taxonomy, stratigraphic distribution and evolutionary classification of the schackoinid planktic foraminifera (late Albian- Maastrichtian, Cretaceous). In, Bailey, D. R. , Howard, S. E. , (ed.) Deep-sea marine biology, geology, and human impact. Nova Publishers, New York 1-62. gs


Groshenyia compiled by the pforams@mikrotax project team viewed: 23-6-2024

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